A circle with a 12 inch diameter has a 6 inch radius.
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12 inch diameter(also 6 inch radius).
diameter is 2 times the radius 24
12 is the diameter if the radius is 6
As the diameter of a circle is twice the radius, a circle with a 6-foot radius would have a diameter of 6 x 2 or 12 feet.
The area of a circle that has a 12-inch diameter is: 113.1 square inches.